CN109458845B - Sintering material distribution air supply system and control method thereof - Google Patents

Sintering material distribution air supply system and control method thereof Download PDF

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Publication number
CN109458845B
CN109458845B CN201811330892.6A CN201811330892A CN109458845B CN 109458845 B CN109458845 B CN 109458845B CN 201811330892 A CN201811330892 A CN 201811330892A CN 109458845 B CN109458845 B CN 109458845B
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air
sintering
trolley
effective
material layer
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CN109458845A (en
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曾小信
李宗平
邱立运
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Zhongye Changtian International Engineering Co Ltd
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Zhongye Changtian International Engineering Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D17/002—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining or circulating atmospheres in heating chambers
    • F27D7/02—Supplying steam, vapour, gases or liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2003/00—Type of treatment of the charge
    • F27M2003/04—Sintering

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The application discloses a sintering material distribution air supply system and a control method thereof. The control method can also control the opening of the air door through the switching value sent by the travel switch. The air door that the system opened bellows automatically and corresponded has been realized to this application, not only satisfied sintering process demand, saved the sintering energy consumption moreover, improved the automatic level of sintering plant, no longer need the manual work to rely on experience operation.

Description

Sintering material distribution air supply system and control method thereof
Technical Field
The application relates to the field of sintering material distribution air supply, in particular to a sintering material distribution air supply system and a control method thereof.
Background
At present, a sintering machine, which is one of key equipment in a sintering plant, needs to be repaired every a period of time, and in addition, the sintering machine also needs to be repaired when stopped due to reasons in ordinary production. Under the existing condition, the sintering machine needs to be stopped when being overhauled, and materials on a trolley of the sintering machine are emptied.
After the overhaul is finished, the sintering machine is restarted, the sintering machine trolleys need to be distributed again, according to the requirement of a sintering process, according to the position that the sintering material level on the first trolley reaches each air box, air doors arranged on the air boxes corresponding to the lower ends of the corresponding sintering machine trolleys are sequentially opened, a main flue of the sintering machine is communicated with the air boxes at the lower ends of the trolleys, a main exhaust fan is connected with the main flue, the sintering material on the sintering machine trolleys is subjected to negative pressure sintering, and after the sintering material is ignited at the ignition furnace position, the sintering material is fully roasted under the condition of subsequent after-effect air volume, so that high-quality sintering ore is obtained.
In the prior art, at present, only an on-site operator observes the charge level of the sintering material on the trolley and then judges whether the charge level reaches the position corresponding to the air box, if the operator observes that the charge level reaches the position corresponding to one air box, the operator in a central control room is informed to sequentially open the air doors corresponding to the air boxes, generally, the sintering machine has dozens of air boxes, the operator in the central control room needs to frequently open the air doors, and the operator observing the charge level of the sintering material on the trolley needs to constantly determine which air box the charge level reaches. If the air box position that the first platform truck charge level reachd is not in time observed to the operative employee, lead to the air door to delay to open, lead to the sintering to put out flame easily, the sintering can't go on, if open the air door in advance, can cause the sintering amount of wind increase of sintering material, effective amount of wind reduces, and main air exhauster energy consumption increases.
So, rely on the operator to survey the charge level of sintering material on the platform truck, open bellows air door in proper order, cause the operating personnel time delay of well accuse indoor easily or open bellows air door in advance to cause the sintering to put out flame, perhaps main air exhauster energy consumption increases, and the manual observation mode, this mode automation level is low, and is inefficient, consumes a large amount of man-hours, is unfavorable for improving sintering intelligence and makes the level.
Disclosure of Invention
The application provides a sintering cloth air supply system and a control method thereof, which are used for solving the problems that sintering flameout caused by improper opening time of an air door and energy consumption of a main exhaust fan are increased due to the fact that an operator observes the material level of a sintering material on a trolley in the prior art.
In a first aspect, the present application provides a sintered cloth air feed system, the system comprising: the device comprises a trolley, a plurality of air boxes, a main flue, a driving motor, a flexible transmission device, a sintering machine star wheel, an encoder, a bottom paving material groove, a mixture ore groove, a round roller feeder, a distributor and a radar thickness gauge, wherein the bottom paving material groove, the mixture ore groove, the round roller feeder, the distributor and the radar thickness gauge are sequentially arranged above the trolley along the running direction of the trolley;
the plurality of air boxes are arranged at the lower end of the trolley;
the lower end of the air box is sequentially provided with an air door and an auxiliary flue, and the auxiliary flue is communicated with the main flue;
the driving motor drives the sintering machine star wheel to rotate through the flexible transmission device;
the sintering machine star wheel is arranged on one side of the trolley and is positioned at the head position of the sintering machine and used for driving the trolley to move;
the encoder is arranged at the bearing of the sintering machine star wheel and synchronously rotates with the sintering machine star wheel.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the encoder is an absolute value encoder.
In a second aspect, the present application provides a sintered cloth air feed system, the system comprising: the device comprises a trolley, a plurality of air boxes, a main flue, a driving motor, a flexible transmission device, a sintering machine star wheel, and a bottom paving material groove, a mixture ore groove, a round roller feeder, a distributor and a radar thickness gauge which are sequentially arranged above the trolley along the running direction of the trolley;
the plurality of air boxes are arranged at the lower end of the trolley;
the lower end of the air box is sequentially provided with an air door and an auxiliary flue, and the auxiliary flue is communicated with the main flue;
the driving motor drives the sintering machine star wheel to rotate through the flexible transmission device;
the sintering machine star wheel is arranged on one side of the trolley and is positioned at the head position of the sintering machine and used for driving the trolley to move;
a plurality of material travel switch devices are arranged behind the radar thickness gauge along the running direction of the trolley;
the material travel switch device corresponds to the air box.
With reference to the second aspect, in a first realizable manner of the second aspect, the material travel switch device includes a travel switch, a travel switch baffle, a baffle support rod, and a material baffle, the baffle support rod is disposed at the upper end of the air box, a baffle rotation shaft is disposed at the upper end of the baffle support rod, the travel switch baffle and the material baffle are respectively connected to the baffle rotation shaft, the travel switch is disposed at one side of the travel switch baffle, and the width of the material baffle is greater than a preset width, so as to ensure that the material baffle contacts the lowest point of the material level of the sintering material.
In a third aspect, the present application provides a method for controlling a sintered cloth air supply system, including:
measuring the material layer thickness of the sintering material by a radar thickness gauge;
judging whether the material layer thickness of the sintering material is larger than the preset material layer thickness;
if the material layer thickness of the sintering material is larger than the preset material layer thickness, timing is started;
calculating the opening time of the air door, and calculating the opening degree of the air door;
judging whether the timing time is greater than or equal to the opening time of the air door;
if the timing time is greater than or equal to the opening time of the air door, opening the air door according to the opening degree of the air door;
counting the number of opened air doors;
judging whether the number of the opened air doors is larger than or equal to the preset number of the air doors or not;
if the number of opened dampers is less than the preset number of dampers, returning to the step of judging whether the timing time is greater than or equal to the opening time of the dampers.
With reference to the third aspect, in a first possible implementation manner of the third aspect, the step of calculating the opening time of the damper includes:
calculating the running speed v of the trolley;
determining the distance Li between the bellows and the radar thickness gauge;
according to the formula Ti＝LiV, determine the open time Ti of the damper.
With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the calculating the running speed v of the trolley is calculated by using the following formula:
v-n × 2 pi D, wherein v: the running speed of the trolley; n: the rotating speed of the star wheel of the sintering machine; d: the diameter of the gear of the star wheel of the sintering machine.
With reference to the third aspect, in a third possible implementation manner of the third aspect, the calculating the opening degree of the damper that opens the windbox is calculated according to the following formula:
Fopening degree＝K3×PNegative pressure×QIs effective；
In the formula: fOpening degree: the target opening value of each air door of the air box; qIs effective: the effective air volume of each air box; pNegative pressure: the lower part of each air box is connected with the negative pressure of the main flue; k3: and the correction coefficient of the opening degree of the air door of each air box.
With reference to the third possible implementation manner of the third aspect, in a fourth possible implementation manner of the third aspect, the step of calculating the effective air volume of the windbox includes:
the radar level gauge detects the material layer thickness h of the sintering material on the trolleyMaterial layer；
Determining the type coefficient P of the sintering material, the average grain diameter of the material and the effective air quantity QSign boardAnd the main flue negative pressure;
calculating the effective air volume of the air box according to the following formula:
Qis effective＝K2×P×Mz×hMaterial layer×QSign board
In the formula: qIs effective: the effective air volume of each air box; k2: the effective air volume correction coefficient of each air box; mz is the average grain diameter of the material layer; p is material type coefficient; h isMaterial layerThe thickness of the layer of sinter material, QSign boardThe standard air volume of each air box.
In combination with the fourth aspect, the present application provides a method for controlling a sintered cloth air supply system, including:
acquiring a switching value signal sent by a travel switch;
according to the switching value signal, the PLC system generates an air door opening signal of the air box;
and the electric regulating valve of the air door receives the opening signal of the air door and opens the air door corresponding to the stroke switch.
According to the technical scheme, the sintering material distribution air supply system and the control method thereof have the advantages that the corresponding air doors are sequentially opened by calculating the time of the sintering material reaching each air box. The control method can also control the opening of the air door through the switching value sent by the travel switch. The air door corresponding to the air box is automatically opened by the system, the requirements of a sintering process are met, the sintering energy consumption is saved, the automation level of a sintering plant is improved, and manual operation based on experience is not needed.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a schematic structural view of a sintered cloth air feed system according to an exemplary embodiment of the present application;
FIG. 2 is a schematic structural view of a sintered cloth air feed system according to another exemplary embodiment of the present application;
FIG. 3 is a front view of a material travel switch assembly shown in accordance with an exemplary embodiment of the present application;
FIG. 4 is a side view of a material travel switch assembly shown in accordance with an exemplary embodiment of the present application;
FIG. 5 is a schematic flow diagram illustrating a method of controlling a sintered cloth air feed system according to an exemplary embodiment of the present application;
FIG. 6 is a flow chart illustrating a method of controlling a sintered cloth air feed system according to another exemplary embodiment of the present application.
The device comprises 1-sintered material, 101-trolley, 102-bellows, 1021-air door, 1022-auxiliary flue, 103-main flue, 104-driving motor, 105-flexible transmission device, 106-sintering machine star wheel, 107-encoder, 108-bottom paving trough, 109-mixture ore trough, 110-round roller feeder, 111-distributor, 112-radar thickness gauge, 113-material travel switch device, 1131-travel switch, 11331-baffle rotating shaft, 1132-travel switch baffle, 1133-baffle supporting rod and 1134-material baffle.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic structural diagram of a sintered cloth air supply system provided in the present application.
A sintering cloth air feed system in this application includes: the device comprises a trolley 101, a plurality of air boxes 102, a main flue 103, a driving motor 104, a flexible transmission device 105, a sintering machine star wheel 106, an encoder 107, and a bottom paving trough 108, a mixture ore trough 109, a round roller feeder 110, a distributor 111 and a radar thickness gauge 112 which are sequentially arranged above the trolley 101 along the running direction of the trolley 101;
it should be noted that, firstly, the bottom material of the sintering material is laid on the sintering machine trolley 101 through the bottom laying trough 108, then the mixture is sent to the round roller feeder 110 through the mixture ore trough 109, then the mixture is sent to the distributor 111 through the round roller feeder 110, the mixture is evenly laid on the trolley 101 through the distributor 111, and finally, a layer of sintering material with a certain thickness is formed on the trolley 101. The trolley 101 drives the sintering material to move, and negative pressure is provided through the bellows to complete sintering of the sintering material. The sintering cloth air supply system in the embodiment of the application saves energy consumption, and overcomes the defects caused by manual participation in sintering work in the prior art.
Wherein, the distributing device 111 in the present application may be a nine-roller distributing device.
The plurality of air boxes 102 are arranged at the lower end of the trolley 101;
the lower end of the air box 102 is sequentially provided with an air door 1021 and an auxiliary flue 1022, and the auxiliary flue 1022 is communicated with the main flue 103;
it should be noted that the sintering material needs a sufficient amount of air during the sintering process, in the present application, the main flue 103 is connected to a main exhaust fan, and the main exhaust fan provides negative pressure for the sintering material on the sintering pallet, and the negative pressure is finally applied to the sintering material through the main flue 103 and the auxiliary flue 1022.
The air door 1021 is arranged at the lower end of the air box 102, the air door 1021 can control the air quantity provided by the auxiliary flue 1022 to the air box 102, when the air door 1021 is completely closed, the negative pressure in the auxiliary flue 1022 does not act on the air box 102, and in addition, the air door 1021 can also control the negative pressure provided by the auxiliary flue 1022 to the air box 102 through the air door opening degree of the air door.
The driving motor 104 drives the sintering machine star wheel 106 to rotate through the flexible transmission device 105;
the sintering machine star wheel 106 is arranged on one side of the trolley 101, is positioned at the head position of the sintering machine, and is used for driving the trolley 101 to move;
specifically, the driving motor 104 in the embodiment of the present application is disposed at the head of the sintering machine, and the driving motor 104 drives the sintering machine star wheel 106 to rotate through the flexible transmission device 105, so as to drive the sintering machine trolley 101 to move.
The encoder 107 is arranged at a bearing of the sintering machine star wheel 106, the encoder 107 and the sintering machine star wheel 106 rotate synchronously, and specifically, the encoder 107 also rotates one circle while the sintering machine star wheel 106 rotates one circle.
Further, the encoder 107 is an absolute value encoder.
Specifically, the absolute value encoder has a function of maintaining position data in a power-down mode, the absolute value encoder is powered off, when the absolute value encoder is powered on again, the absolute value encoder can judge the position where the current sintering machine charge level reaches from the last power-down position, the opening time of the subsequent air box at the power-down position is recalculated, and the specific position of the trolley is equal to the sum of the last power-down position data and the current trolley walking distance.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a sintered cloth air supply system according to another embodiment of the present application.
The sintering cloth air feed system in the embodiment of the application comprises: the device comprises a trolley 101, a plurality of air boxes 102, a main flue 103, a driving motor 104, a flexible transmission device 105, a sintering machine star wheel 106, and a bottom paving trough 108, a mixture ore trough 109, a round roller feeder 110, a distributor 111 and a radar thickness gauge 112 which are sequentially arranged above the trolley 101 along the running direction of the trolley 101;
the plurality of air boxes 102 are arranged at the lower end of the trolley 101;
the lower end of the air box 102 is sequentially provided with an air door 1021 and an auxiliary flue 1022, and the auxiliary flue 1022 is communicated with the main flue 103;
the driving motor 104 drives the sintering machine star wheel 106 to rotate through the flexible transmission device 105;
the sintering machine star wheel 106 is arranged on one side of the trolley 101, is positioned at the head position of the sintering machine, and is used for driving the trolley 101 to move;
a plurality of material travel switch devices 113 are arranged behind the radar thickness gauge 112 along the running direction of the trolley 101;
the material travel switch device 113 corresponds to the air box 102.
The sintering and distributing air supply system provided by the embodiment of the application starts from the material distributor 111, the material travel switch device 113 is installed on each trolley 101, when sintered materials are conveyed to the material travel switch device 113, the material travel switch device 113 contacts the sintered materials, the material travel switch device 113 can generate a switch signal to the main control system, the main control system opens the corresponding air door of the air box according to the switch signal, and in the embodiment of the application, the position of each air box 102 is correspondingly provided with one material travel switch device 113.
Because each air box 102 is correspondingly provided with a material travel switch device 113, when the sintering material touches the material travel switch device 113, the sintering material is conveyed to the position of the air box 102 corresponding to the material travel switch device 113 by the trolley 101, at the moment, the air door is controlled to be opened, the sintering material can be roasted, and thus, sintering resources are not wasted. When the sintering material does not reach the designated air box position, if the air door is opened, the energy consumption of the main exhaust fan is increased. If the damper is opened later, this may cause the sinter to misfire. According to the embodiment of the application, the opening time of the air door 1021 is determined through the material travel switch device 113, and the problems of energy consumption increase of a main exhaust fan and sintering flameout caused by manual operation are solved.
Referring to fig. 3-4, the material stroke switch device 113 includes a stroke switch 1131, a stroke switch baffle 1132, a baffle support rod 1133 and a material baffle 1134, the baffle support rod 1133 is disposed at the upper end of the wind box 102, a baffle rotation shaft 11331 is disposed at the upper end of the baffle support rod 1133, the stroke switch baffle 1132 and the material baffle 1134 are respectively connected to the baffle rotation shaft 11331, the stroke switch 1131 is disposed at one side of the stroke switch baffle 1132, and the width of the material baffle 1134 is greater than a preset width, so as to ensure that the material baffle 1134 contacts the lowest point of the charge level of the sintering material.
Specifically, platform truck 101 drives the sintering material and removes, and when first platform truck sintering material removed material travel switch device 113 department, the sintering material touched material baffle 1134 when, can promote material baffle 1134 and upwards rotated, and travel switch baffle 1132 and material baffle 1134 can rotate around baffle axis of rotation 11331 to drive travel switch baffle 1132 upper end and down rotate.
When the upper end of the travel switch shield 1132 rotates downward to a certain angle, it touches the roller and the rotating arm of the travel switch 1131. When the rotating arm of the travel switch 1131 rotates a certain angle, the normally open contact inside the travel switch 1131 is closed, so that the 24VDC or 220VAC signal connected to the travel switch contact is closed, i.e., a switching value signal is generated to the main process PLC system. The main process PLC system generates an opening signal corresponding to the air door 1021 according to the signal, the electric regulating valve on the air door 1021 receives an opening value signal, namely, the air door 1021 is opened, and the opening value is subjected to closed-loop control regulation according to the opening degree of a given air door.
It should be noted that the lower end position of the material baffle 1134 in the embodiment of the present application must exceed the lowest level position of the sintering material, and when the level of the sintering material passes through the material baffle 1134, the material baffle 1134 is required to rotate by more than a threshold angle, which can make the stroke switch baffle 1132 collide with the roller and the rotating arm of the stroke switch 1131, so that the contact of the stroke switch 1131 is reliably closed, and the rotating angle of the material baffle and the rotating angle of the stroke switch baffle in the present application are consistent. In addition, the width of the material baffle 1134 exceeds a predetermined width to ensure that the sintering material can push the material baffle 1134 to rotate.
The travel switch 1131 is used for judging whether the sintering material reaches the position of the air box 102, and the travel switch 1131 has two contacts, one contact is connected with a 24VDC or 220VAC signal, and the other contact is connected to the IO module terminal of the main process PLC system.
The travel switch is used for sensing the position of the initial charge level of the trolley and selecting the travel switch with high protection grade and high reliability.
And the IO module is used for receiving the switching value signal of the travel switch and transmitting the signal to the process PLC module.
And the main process PLC module outputs an opening signal of the electric air door regulating valve to the electric regulating valve according to the switching value signal of the travel switch.
The air door in this application embodiment is provided with electrical control valve, and electrical control valve is the actuating mechanism that bellows air door opened, receives opening signal, can drive bellows air door and open.
Because the sintering material moves along with the trolley, the sintering material can touch the material travel switch device corresponding to each air box, at the moment, the main process PLC system sequentially receives switching value signals sent by the travel switches at the corresponding positions of the air boxes, and the air doors corresponding to the air boxes are sequentially opened, so that the sintering material distribution air supply function of the control system is realized.
Referring to fig. 5, fig. 5 is a schematic flow chart of a control method of a sintered material distribution air supply system. The control method of the embodiment of the application is applied to a sintering material distribution air supply system provided with an encoder, and comprises the following steps:
step 101: measuring the material layer thickness of the sintering material by a radar thickness gauge;
specifically, when a sintering and distributing air supply system is used, a driving motor of a sintering machine, a circular roller feeder and a distributor are started at first. The driving motor drives the star wheel of the sintering machine to operate through the flexible transmission device, and the trolley moves along with the star wheel. The sintering material in the embodiment of the application consists of a bottom material and a mixture, wherein the bottom material is laid on the trolley through a bottom laying trough, and the mixture is laid on the trolley through a distributor. The sintering material moves on the trolley along with the trolley and passes through each bellows to complete the sintering task. The radar thickness gauge in the embodiment of the application is used for measuring the thickness of a material layer of a sintering material.
Step 102: judging whether the material layer thickness of the sintering material is larger than the preset material layer thickness;
step 103: if the material layer thickness of the sintering material is larger than the preset material layer thickness, timing is started;
specifically, the thickness of the material layer detected by the radar level gauge indicates that the material of the sintering machine reaches the position of the sintering machine corresponding to the radar thickness gauge if the thickness of the material layer is larger than the preset thickness of the material layer, and timing is started from the time.
Step 104: calculating the opening time of the air door, and calculating the opening degree of the air door;
and opening the air door according to the opening time of each air door and the opening degree of the air door. Specifically, since the sintered material needs to pass through all the bellows for a certain period of time, the opening time of each bellows is different, and the opening time of each damper needs to be calculated. The opening degree of the air door affects the sintering condition of the sinter and also affects the consumption of sintering energy.
Step 105: judging whether the timing time is greater than or equal to the opening time of the air door;
step 106: if the timing time is greater than or equal to the opening time of the air door, opening the air door according to the opening degree of the air door;
the embodiment of the application can adopt a timer for timing, and the timer can adopt a zero clearing method before timing. And when the sintering material reaches the position of the radar thickness gauge, resetting the timer, and starting timing by the timer.
Specifically, if the timing time is longer than or equal to the opening time of the air door, at this time, it is indicated that the sintering material has entered the position on the trolley corresponding to the air box, at this time, the air door is opened, and the sintering material is sintered by using the negative pressure.
Step 107: counting the number of opened air doors;
step 108: judging whether the number of the opened air doors is larger than or equal to the preset number of the air doors or not;
step 109: if the number of opened dampers is less than the preset number of dampers, then the process returns to step 105.
It should be noted that, after counting the number of opened air doors, it is determined whether the number of opened air doors is greater than or equal to the number of preset air doors, where the number of preset air doors may be the total number of all air doors set in the sintering machine, and when the number of opened air doors is greater than or equal to the number of preset air doors, the whole process is ended. If the number of the opened air doors is less than the preset number of the air doors, the step 105 is continued again, and the air doors meeting the opening time of the air doors are opened until the number of the opened air doors is greater than or equal to the preset number of the air doors.
In some preferred embodiments, the step of calculating the opening time of the damper comprises:
calculating the running speed v of the trolley;
determining the distance Li between the bellows and the radar thickness gauge;
specifically, the position of each windbox on the sintering machine is fixed and known, so that the distance L of each windbox from the radar thickness gauge position can be easily determinedi。
According to the formula Ti＝LiV, determining the opening time T of the damperi。
In the formula:
Ti: opening time of each air box air door, unit: s;
Li: distance of each bellows from the radar thickness gauge, unit: m;
v: sintering machine trolley running speed, unit: m/s;
by the formula Ti＝LiV, determine the open time of each windbox, and the control system delays that time to open the damper of the corresponding windbox.
In some preferred embodiments, the running speed v of the trolley is calculated by using the following formula:
v＝n×2πD；
wherein, v: running speed of the trolley, unit: m/s; n: rotation speed of sintering machine star wheel, unit: r/s, the rotating speed of the star wheel of the sintering machine is detected by an encoder; d: toothed plate diameter of sintering machine star wheel, unit: and m is selected.
According to the control method, the radar level gauge detects the thickness of a material layer, the time for sintering the first trolley material to reach is judged, timing is started from the time, and air box air doors are opened in sequence according to the opening time of each air box air door. And (4) according to the machine speed of the sintering machine detected by the encoder and the distance between each air box and the position of the radar level gauge, calculating the opening time of each air box.
In some preferred embodiments, the calculating the opening degree of the damper for opening the windbox is calculated according to the following formula:
Fopening degree＝K3×PNegative pressure×QIs effective；
In the formula: fOpening degree: the target opening value of each air door of the air box; qIs effective: effective air volume of each air box, unit: m 3/h; p, negative pressure: negative pressure of the main flue of each bellows lower part connection, unit: pa; k3: and the correction coefficient of the opening degree of the air door of each air box.
According to the opening degree F of the air doorOpening degreeThe opening degree of the air door is adjusted, so that the sintering material is fully roasted, and meanwhile, the energy consumption loss of the main exhaust fan is avoided. The opening degree of the air door is too small, so that the sintering material is not fully roasted, and the quality of the sintering ore is influenced; the air door aperture is too big, can cause main air exhauster load increase, and the energy consumption increases, increases the operating cost of enterprise.
In some preferred embodiments, the specific step of calculating the effective air volume of the windbox includes:
the radar level gauge detects the material layer thickness h of the sintering material on the trolleyMaterial layer；
Determining the type coefficient P of the sintering material, the average grain diameter of the material and the effective air quantity QSign boardAnd the main fluePressing;
calculating the effective air volume of the air box according to the following formula:
Qis effective＝K2×P×Mz×hMaterial layer×QSign board
In the formula: qIs effective: effective air volume of each air box, unit: m is3/h；K2: the effective air volume correction coefficient of each air box; mz is the average particle size of material layers, unit: mm; p is material type coefficient; h isMaterial layerThe material layer thickness of the sintering material, unit mm, QSign boardThe standard air volume of each air box.
In the embodiment of the application, the air door opening obtained by the calculation method meets the process requirements and saves energy consumption when the air door of the air box is opened.
Wherein, the type coefficient of the sintering material is different proportion coefficients according to several conventional common sintering materials, and the value range of the proportion coefficients is 0-100%. In addition, the standard air volume is QSign boardThe air quantity required for fully roasting the sintering material in a standard state is known through tests.
Referring to fig. 6, fig. 6 is a schematic flow chart of another control method of the sintered cloth air supply system. The embodiment of the application provides another control method of a sintering material distribution air supply system, and the control method of the embodiment of the application is applied to the sintering material distribution air supply system provided with a material travel switch device, and comprises the following steps:
step 201: acquiring a switching value signal sent by a travel switch;
specifically, travel switch is used for the position of response platform truck charge level, and this application embodiment adopts the travel switch of high protection level, high reliability.
Step 202: according to the switching value signal, the PLC system generates an air door opening signal of the air box;
and according to the switching value signal sent by the travel switch, the PLC system generates an air door opening signal of the air box. In the embodiment of the application, the opening signal of the air door not only comprises a simple opening signal or a simple closing signal, but also causes insufficient roasting of sinter due to too small opening degree of the air door, thereby influencing the quality of the sinter; the air door opening degree is too large, so that the energy consumption of the main exhaust fan is increased. The calculation method of the opening degree of the damper has already been proposed in the above, and will not be described herein.
Step 203: and the electric regulating valve of the air door receives the opening signal of the air door and opens the air door corresponding to the stroke switch.
Specifically, the electric regulating valve of the air door is an actuating mechanism for opening the air door, and when the electric regulating valve receives an opening signal of the air door, the electric regulating valve can drive the air door to open.
According to the embodiment of the application, the stroke switch device is correspondingly arranged on each air box of the sintering machine, the position of the material reaching the air box is judged through the switch signal sent by the stroke switch device, the air door of the air box is opened in sequence, the operation method of manually realizing the opening and closing of the air door in the prior art can be avoided, and the automation level of the sintering machine is improved.
According to the technical scheme, the sintering material distribution air supply system and the control method thereof can calculate the time of the sintering material reaching each air box, and the corresponding air doors are opened in sequence according to the calculated time for opening the air doors. The control method can also control the opening of the air door through the switching value sent by the travel switch. Therefore, the air door corresponding to the air box can be automatically opened by the system, the requirements of the sintering process are met, the sintering energy consumption is saved, the automation level of a sintering plant is improved, and manual operation by experience is not needed.
The same and similar parts in the various embodiments in this specification may be referred to each other.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (9)

1. A sintered cloth air feed system, the system comprising: the device comprises a trolley (101), a plurality of air boxes (102), a main flue (103), a driving motor (104), a flexible transmission device (105), a sintering machine star wheel (106), an encoder (107), and a bottom paving material groove (108), a mixed material ore groove (109), a round roller feeder (110), a distributor (111) and a radar thickness gauge (112) which are sequentially arranged above the trolley (101) along the running direction of the trolley (101);
the plurality of air boxes (102) are arranged at the lower end of the trolley (101);
the lower end of the air box (102) is sequentially provided with an air door (1021) and an auxiliary flue (1022), and the auxiliary flue (1022) is communicated with the main flue (103);
the driving motor (104) drives the sintering machine star wheel (106) to rotate through the flexible transmission device (105); the sintering machine star wheel (106) is arranged on one side of the trolley (101), is positioned at the head position of the sintering machine and is used for driving the trolley (101) to move;
the encoder (107) is arranged at a bearing of the sintering machine star wheel (106), and the encoder (107) and the sintering machine star wheel (106) synchronously rotate;
the control method of the system comprises the following steps:
measuring the material layer thickness of the sintering material by a radar thickness gauge;
timing by adopting a timer, resetting the timer before timing, judging whether the material layer thickness of the sintering material is larger than the preset material layer thickness, and starting timing by the timer if the material layer thickness of the sintering material is larger than the preset material layer thickness;
calculating the opening time of the air door, and calculating the opening degree of the air door;
judging whether the timing time is greater than or equal to the opening time of the air door;
if the timing time is greater than or equal to the opening time of the air door, opening the air door according to the opening degree of the air door;
counting the number of opened air doors;
judging whether the number of the opened air doors is larger than or equal to the preset number of the air doors or not;
if the number of the opened air doors is less than the preset number of the air doors, returning to the step of judging whether the timing time is greater than or equal to the opening time of the air doors;
when the number of the opened air doors is larger than or equal to the preset number of the air doors, the whole process is ended;
the step of calculating the opening time of the damper includes:
calculating the running speed v of the trolley;
determining the distance Li between each bellows and the radar thickness gauge;
according to the formula Ti＝LiV, determine the open time Ti for each windbox damper.
2. Sintered cloth air feed system according to claim 1, characterized in that the encoder (107) is an absolute value encoder.
3. The sinter distribution air supply system of claim 2, wherein the running speed v of the trolley is calculated by using the following formula:
v＝n×2πD；
wherein, v: the running speed of the trolley; n: the rotating speed of the star wheel of the sintering machine is detected by an encoder; d: the diameter of a toothed plate of a star wheel of the sintering machine.
4. A sintered cloth air feed system as claimed in claim 3, wherein the calculated opening degree of the dampers for opening the windboxes is calculated according to the following formula:
Fopening degree＝K3×PNegative pressure×QIs effective
In the formula: fOpening degree: the target opening value of each air door of the air box; qIs effective: the effective air volume of each air box; pNegative pressure: the lower part of each air box is connected with the negative pressure of the main flue; k3: and the correction coefficient of the opening degree of the air door of each air box.
5. The sintered cloth air feed system of claim 4, wherein the specific step of calculating the effective air volume of the windbox comprises:
the radar level gauge detects the material layer thickness h of the sintering material on the trolleyMaterial layer；
Determining the type coefficient P of the sintering material, the average grain diameter of the material and the effective air quantity QSign boardAnd the main flue negative pressure;
calculating the effective air volume of the air box according to the following formula:
Qis effective＝K2×P×Mz×hMaterial layer×QSign board
In the formula: qIs effective: the effective air volume of each air box; k2: the effective air volume correction coefficient of each air box; mz is the average grain diameter of the material layer; p is material type coefficient; h isMaterial layerThe thickness of the layer of sinter material, QSign boardThe standard air volume of each air box.
6. A control method of a sintering material distribution air supply system is characterized in that,
the sintering cloth air supply system comprises: the device comprises a trolley (101), a plurality of air boxes (102), a main flue (103), a driving motor (104), a flexible transmission device (105), a sintering machine star wheel (106), an encoder (107), and a bottom paving material groove (108), a mixed material ore groove (109), a round roller feeder (110), a distributor (111) and a radar thickness gauge (112) which are sequentially arranged above the trolley (101) along the running direction of the trolley (101);
the plurality of air boxes (102) are arranged at the lower end of the trolley (101);
the lower end of the air box (102) is sequentially provided with an air door (1021) and an auxiliary flue (1022), and the auxiliary flue (1022) is communicated with the main flue (103);
the driving motor (104) drives the sintering machine star wheel (106) to rotate through the flexible transmission device (105); the sintering machine star wheel (106) is arranged on one side of the trolley (101), is positioned at the head position of the sintering machine and is used for driving the trolley (101) to move;
the encoder (107) is arranged at a bearing of the sintering machine star wheel (106), and the encoder (107) and the sintering machine star wheel (106) synchronously rotate;
the method comprises the following steps:
measuring the material layer thickness of the sintering material by a radar thickness gauge;
timing by adopting a timer, resetting the timer before timing, judging whether the material layer thickness of the sintering material is larger than the preset material layer thickness, and starting timing by the timer if the material layer thickness of the sintering material is larger than the preset material layer thickness;
calculating the opening time of the air door, and calculating the opening degree of the air door;
judging whether the timing time is greater than or equal to the opening time of the air door;
if the timing time is greater than or equal to the opening time of the air door, opening the air door according to the opening degree of the air door;
counting the number of opened air doors;
judging whether the number of the opened air doors is larger than or equal to the preset number of the air doors or not;
if the number of the opened air doors is less than the preset number of the air doors, returning to the step of judging whether the timing time is greater than or equal to the opening time of the air doors;
when the number of the opened air doors is larger than or equal to the preset number of the air doors, the whole process is ended;
the step of calculating the opening time of the damper includes:
calculating the running speed v of the trolley;
determining the distance Li between each bellows and the radar thickness gauge;
according to the formula Ti＝LiV, determine the open time Ti for each windbox damper.
7. The method for controlling a sintered material distribution air supply system according to claim 6, wherein the running speed v of the trolley is calculated by using the following formula:
v＝n×2πD；
wherein, v: the running speed of the trolley; n: the rotating speed of the star wheel of the sintering machine is detected by an encoder; d: the diameter of a toothed plate of a star wheel of the sintering machine.
8. The method for controlling a sintered material distribution air feed system according to claim 7, wherein the opening degree of the damper for opening the windbox is calculated according to the following formula:
Fopening degree＝K3×PNegative pressure×QIs effective
In the formula: fOpening degree: the target opening value of each air door of the air box; qIs effective: the effective air volume of each air box; pNegative pressure: the lower part of each air box is connected with the negative pressure of the main flue; k3: and the correction coefficient of the opening degree of the air door of each air box.
9. The method for controlling a sintered material distribution air supply system according to claim 8, wherein the step of calculating the effective air volume of the windbox comprises:
the radar level gauge detects the material layer thickness h of the sintering material on the trolleyMaterial layer；
Determining the type coefficient P of the sintering material, the average grain diameter of the material and the effective air quantity QSign boardAnd the main flue negative pressure;
calculating the effective air volume of the air box according to the following formula:
Qis effective＝K2×P×Mz×hMaterial layer×QSign board
In the formula: qIs effective: the effective air volume of each air box; k2: the effective air volume correction coefficient of each air box; mz is the average grain diameter of the material layer; p is material type coefficient; h isMaterial layerThe thickness of the layer of sinter material, QSign boardThe standard air volume of each air box.
CN201811330892.6A 2018-11-09 2018-11-09 Sintering material distribution air supply system and control method thereof Active CN109458845B (en)

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